51222171 has 64 divisors (see below), whose sum is σ = 94381056. Its totient is φ = 23846400.

The previous prime is 51222163. The next prime is 51222187. The reversal of 51222171 is 17122215.

It is not a de Polignac number, because 51222171 - 2³ = 51222163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (51222121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 110881 + ... + 111341.

It is an arithmetic number, because the mean of its divisors is an integer number (1474704).

Almost surely, 2^51222171 is an apocalyptic number.

51222171 is a deficient number, since it is larger than the sum of its proper divisors (43158885).

51222171 is a wasteful number, since it uses less digits than its factorization.

51222171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532.

The product of its digits is 280, while the sum is 21.

The square root of 51222171 is about 7156.9666060420. The cubic root of 51222171 is about 371.3806972179.

Adding to 51222171 its reverse (17122215), we get a palindrome (68344386).

It can be divided in two parts, 51 and 222171, that added together give a palindrome (222222).

The spelling of 51222171 in words is "fifty-one million, two hundred twenty-two thousand, one hundred seventy-one".